CN102271397A - Positioning system and method based on WIFI (Wireless Fidelity) network - Google Patents
Positioning system and method based on WIFI (Wireless Fidelity) network Download PDFInfo
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- CN102271397A CN102271397A CN2011102679225A CN201110267922A CN102271397A CN 102271397 A CN102271397 A CN 102271397A CN 2011102679225 A CN2011102679225 A CN 2011102679225A CN 201110267922 A CN201110267922 A CN 201110267922A CN 102271397 A CN102271397 A CN 102271397A
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Abstract
The invention relates to the technical field of Internet of Things, providing a positioning system based on a WIFI (Wireless Fidelity) network. The positioning system based on a WIFI network comprises a label, a receiver and a positioning server, wherein the label is arranged on an object which needs to be positioned; the receiver sends a field intensity signal; the label searches and sends out the field intensity signal; and the positioning server receives the field intensity signal sent by the label, and processes and calculates the field intensity signal to obtain the positioning information of the label. According to the system and the method, full-range, full-coverage and full-range positioning can be carried out, the mobile label can be positioned to a specified receiver position point, and the label can be positioned on any position within the coverage range of the whole system according to characteristics. Compared with the RFID (Radio Frequency Identification Devices) technology which is widely applied at present, the method has the advantages that positioning precision is obviously improved, the indoor positioning precision can be within 5 meters, the amount of AP (Access Point) does not need to be largely increased, and the total cost of the system is obviously lowered. The method and the system have wide market prospect.
Description
Technical field
The present invention relates to communication technique field, particularly relate to a kind of WIFI navigation system and method.
Background technology
At present, in the wireless location technology field, the radio frequency ID technology that adopt more, when using this location technology, only mobile tag can be navigated on the fixed position point at wireless access node (Access Point is called for short AP) or RFID trigger place the location of promptly realizing point-to-point, but can not accurately navigate to the optional position between two AP or AP and the RFID trigger, realize gamut, all standing, complete trails location.
At present, general locate mode is: send particular frame by label to receiver, judge label by receiver (AP or trigger) near which receiver according to the signal strength of label emission, different receivers receives time of signal can not be synchronous.This temporal error will influence locating effect greatly when participating in the location computing, cause bigger position error.
At present, because label is a particular frame to the receiver transmission, positioning label (Tag) needs specific trigger and specific wireless aps, can not use general wireless router location, has limited the expanded application of technology such as broadband wireless data communication in the navigation system field.
In addition, adopt the RFID technological orientation, the raising of positioning accuracy is depended on the increase of AP or RFID flip flop number, significantly improved the navigation system lower deployment cost.Simultaneously, AP or RFID trigger hypotelorism also can bring technical barriers such as signal interference, have restricted the raising of positioning accuracy.
WIFI is commonly called as wireless broadband network, is the mature technology of present wireless IP transmission, because it has long transmission distance, bandwidth height, the easy characteristics of networking, is widely used in all trades and professions.
Along with the generally deployment of WIFI network in entire society, a lot of units have all disposed the WIFI network, and in such unit, if realization wireless location, also need to dispose RFID equipment in addition, this causes significant wastage, has increased cost of investment and administrative burden.
Summary of the invention
In order to overcome the prior art defective, the invention provides a kind of navigation system and method based on the WIFI network, technical scheme of the present invention is as follows:
Navigation system based on the WIFI network is characterized in that, comprises:
Label is arranged on the article that need the location;
Receiver sends field intensity signal, and this label is searched this field intensity signal, and sends;
Location-server receives the field intensity signal that this label sends, and handles and calculate, and obtains the locating information of this label.
The navigation system based on the WIFI network as above is characterized in that, this label is for using the label of 802.11b protocol communication.
Localization method based on the WIFI network is characterized in that, comprises following steps:
Step 1: label and receiver are shaken hands, and obtain the network address in the net;
Step 2: the field intensity that the tag scan receiver is sent;
Step 3: label sends to location-server with the field intensity value that scans;
Step 4: location-server obtains the field intensity value of label and the position of calculating label.
The localization method based on the WIFI network as above is characterized in that, the method that this step 4 location-server calculates the position of label comprises following steps:
Step 41: the initial threshold of setting field intensity;
Step 42: the link starting point that obtains the location;
Step 43: obtain field intensity fingerprint recording chained list;
Step 44: handle field intensity fingerprint recording chained list, obtain the weighting coordinate of field intensity fingerprint;
Step 45: set up the second field intensity fingerprint chained list;
Step 46: obtain tag location information.
Localization method as above based on the WIFI network, it is characterized in that, the method that this step 42 obtains the link starting point of location is: receive the field intensity signal of label online acquisition when location-server after, the signal space distance of certain record in the field intensity fingerprint database that the field intensity finger print data that is comprised in the signal and off-line are preserved is during less than this initial threshold, and just the field intensity finger print data that this online acquisition is arrived is as the link starting point of whole localization method.
As above localization method based on the WIFI network, it is characterized in that, the method that this step 43 obtains field intensity fingerprint recording chained list is: repeat this step 42, obtain the field intensity finger print data of other coupling, the link starting point that obtained and the field intensity finger print data of other coupling are preserved, form field intensity fingerprint recording chained list.
The localization method based on the WIFI network as above is characterized in that, this step 44 is handled field intensity fingerprint recording chained list, and the method that obtains the weighting coordinate of field intensity fingerprint is:
Field intensity fingerprint in the chained list is sorted apart from size according to signal space earlier;
Adopt weighting algorithm then, to each fingerprint coordinate obtain weighting coordinate P1 (x, y).
As above localization method based on the WIFI network, it is characterized in that, the method that this step 45 is set up the second field intensity fingerprint chained list is: use the coordinate of each record in the field intensity fingerprint recording chained list in the step 43 and the weighting coordinate that step 44 calculates to carry out air line distance calculating, set limits of error value D, air line distance and D compare, filter out field intensity fingerprint recording bigger than normal, obtain satisfactory record, these records form the second field intensity fingerprint chained list.
The localization method based on the WIFI network as above is characterized in that, the method that this step 46 obtains tag location information comprises: with the second field intensity fingerprint chained list execution in step 44, obtain the second weighting coordinate P2 (x, y).
Localization method as above based on the WIFI network, it is characterized in that the method that this step 46 obtains tag location information also comprises: reduce limits of error value D in certain proportion, repeated execution of steps 44 and step 45, up to weighting coordinate P (x, y) can't refilter till.
The invention has the beneficial effects as follows:
1. the positioning accuracy height is surveyed indoor position accuracy and is reached in 5 meters.
2. can use general WIFI wireless router to position, not need specific receiver, according to different positioning requirements scopes, 3 routers of minimum need just can be realized accurately location, have reduced the system deployment cost.
3, the label life-span long, adopt low power dissipation design, designed life was above 1 year.
4, the location capacity is big: adopt database that label is carried out back-stage management, can monitor 65536 labels simultaneously at most.
Description of drawings
Fig. 1 is the structured flowchart that the present invention is based on the navigation system of WIFI network.
Fig. 2 is the schematic flow sheet that the present invention is based on the localization method of WIFI network.
Fig. 3 is the schematic flow sheet of location-server processing of the present invention with compute location information.
Embodiment
Describe the present invention in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structured flowchart that the present invention is based on the navigation system of WIFI network, and system of the present invention is by forming as the lower part:
Label 101 is arranged on any article that need the location;
AP (receiver) 102 sends field intensity signal, and this label 101 is searched this field intensity signal, and sends;
Location-server 103 receives the field intensity signal that this label 101 sends, and handles and calculate, and obtains the locating information of label.
The present invention uses label monitoring AP signal, and uses the field intensity difference algorithm to position, because near the field intensity signal search of use label, so the time synchronization problem of signal has obtained good solution.Owing to use label search receiver field intensity, the transmitting power of receiver so can obtain bigger signal to noise ratio information, further improves positioning accuracy much larger than the label transmitting power in addition.
Label of the present invention uses the 802.11b protocol communication, integrated complete protocol stack in label, thereby do not need specific receiver, only use common WIFI router just can position.
Fig. 2 is the particular flow sheet that the present invention is based on the localization method of WIFI network, and the inventive method comprises following steps:
Step 1: label 101 is shaken hands with AP102, and obtains ip (network address) in the net;
Step 2: the field intensity that label 101 scan A P102 send;
Step 3: label 101 sends to location-server 103 with the field intensity value that scans;
Step 4: location-server 103 obtains the field intensity value of label 101 and the position of calculating label 103.
Location algorithm of the present invention uses the algorithm that merges mutually based on field intensity difference and field intensity fingerprint recognition, further improves positioning accuracy.In traditional RFID technology, having the location algorithm of using to be based on the algorithm of probability, is a kind of based on probabilistic algorithm based on the algorithm of probability, and it is very complicated.Algorithm is complicated more, and the parameter that relates to is many more, implements just difficult more in product, and the uncertain factor of its positioning result is also just many more.The then creationary employing of the present invention is based on deterministic matching algorithm, with the dynamic filtration coupling of recurrence, exchanged the performance boost of positioning accuracy and accuracy preferably for the complexity of minimum.
Fig. 3 is the schematic flow sheet of location-server processing of the present invention with compute location information.The computational methods of locating information comprise following steps:
Step 41: the initial threshold of setting field intensity.When the coupling beginning, set the initial threshold of field intensity, in each step of back,, compare the reference field intensity finger print data collection of some according to this threshold value.The size of threshold value can be set according to current needs.
Step 42: the link starting point that obtains the location.Receive the field intensity signal of label 101 online acquisition when location-server 103 after, the signal space distance of certain record in the field intensity fingerprint database that the field intensity finger print data that is comprised in the signal and off-line are preserved is during less than this initial threshold, be that tentatively the match is successful, the field intensity finger print data that the present invention just arrives this online acquisition is as the link starting point of whole localization method.Repeated execution of steps 42 then, obtain the field intensity finger print data of other coupling.
Step 43: obtain field intensity fingerprint recording chained list.Repeated execution of steps 42 preserves the link starting point that obtained and the field intensity finger print data of other coupling get off, and forms field intensity fingerprint recording chained list.This process lasts till relatively intact all records, if can't match the record of abundant (proper more than at least 3) according to the initial field intensity threshold value of setting in the step 41, then needs dynamically to strengthen threshold value, and repeating step 42 then.Till obtaining a plurality of field intensity fingerprint recording chained lists that the match is successful.
Step 44: handle field intensity fingerprint recording chained list, obtain the weighting coordinate of field intensity fingerprint.Field intensity fingerprint in the chained list is sorted apart from size according to signal space earlier.Adopt weighting algorithm then, to each fingerprint coordinate obtain weighting coordinate P1 (x, y).
Step 45: set up the second field intensity fingerprint chained list.The coordinate of each record in the field intensity fingerprint recording chained list in the use step 43 and the weighting coordinate that step 44 calculates carry out air line distance and calculate.Set limits of error value D.Air line distance and D compare, and filter out field intensity fingerprint recording bigger than normal, obtain satisfactory record, and these records form the second field intensity fingerprint chained list.
Step 46: obtain tag location information.With the second field intensity fingerprint chained list execution in step 44, obtain the second weighting coordinate P2 (x, y).Reduce limits of error value D in certain proportion, repeated execution of steps 44 and step 45, up to weighting coordinate P (x, y) can't refilter till.(x y) is final positioning result to weighting coordinate P.Just location-server 103 is handled and the locating information that calculates label.
The present invention is based on the navigation system of WIFI network, can carry out gamut, all standing, complete trails location, not only mobile tag can be navigated on the specific receiver location point, can also be according to the location algorithm of characteristics with the optional position of tag location in the whole system coverage.Compare present application RFID technology more widely, positioning accuracy obviously improves, and can reach in 5 meters in indoor positioning accuracy, and need not roll up the quantity of AP, has significantly reduced system synthesis originally.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. based on the navigation system of WIFI network, it is characterized in that, comprise:
Label is arranged on the article that need the location;
Receiver sends field intensity signal, and this label is searched this field intensity signal, and sends;
Location-server receives the field intensity signal that this label sends, and handles and calculate, and obtains the locating information of this label.
2. the navigation system based on the WIFI network as claimed in claim 1 is characterized in that, this label is for using the label of 802.11b protocol communication.
3. based on the localization method of WIFI network, it is characterized in that, comprise following steps:
Step 1: label and receiver are shaken hands, and obtain the network address in the net;
Step 2: the field intensity that the tag scan receiver is sent;
Step 3: label sends to location-server with the field intensity value that scans;
Step 4: location-server obtains the field intensity value of label and the position of calculating label.
4. the localization method based on the WIFI network as claimed in claim 3 is characterized in that, the method that this step 4 location-server calculates the position of label comprises following steps:
Step 41: the initial threshold of setting field intensity;
Step 42: the link starting point that obtains the location;
Step 43: obtain field intensity fingerprint recording chained list;
Step 44: handle field intensity fingerprint recording chained list, obtain the weighting coordinate of field intensity fingerprint;
Step 45: set up the second field intensity fingerprint chained list;
Step 46: obtain tag location information.
5. the localization method based on the WIFI network as claimed in claim 4, it is characterized in that, the method that this step 42 obtains the link starting point of location is: receive the field intensity signal of label online acquisition when location-server after, the signal space distance of certain record in the field intensity fingerprint database that the field intensity finger print data that is comprised in the signal and off-line are preserved is during less than this initial threshold, and just the field intensity finger print data that this online acquisition is arrived is as the link starting point of whole localization method.
6. the localization method based on the WIFI network as claimed in claim 5, it is characterized in that, the method that this step 43 obtains field intensity fingerprint recording chained list is: repeat this step 42, obtain the field intensity finger print data of other coupling, the link starting point that obtained and the field intensity finger print data of other coupling are preserved, form field intensity fingerprint recording chained list.
7. the localization method based on the WIFI network as claimed in claim 6 is characterized in that, this step 44 is handled field intensity fingerprint recording chained list, and the method that obtains the weighting coordinate of field intensity fingerprint is:
Field intensity fingerprint in the chained list is sorted apart from size according to signal space earlier;
Adopt weighting algorithm then, to each fingerprint coordinate obtain weighting coordinate P1 (x, y).
8. the localization method based on the WIFI network as claimed in claim 7, it is characterized in that, the method that this step 45 is set up the second field intensity fingerprint chained list is: use the coordinate of each record in the field intensity fingerprint recording chained list in the step 43 and the weighting coordinate that step 44 calculates to carry out air line distance calculating, set limits of error value D, air line distance and D compare, filter out field intensity fingerprint recording bigger than normal, obtain satisfactory record, these records form the second field intensity fingerprint chained list.
9. the localization method based on the WIFI network as claimed in claim 8 is characterized in that, the method that this step 46 obtains tag location information comprises: with the second field intensity fingerprint chained list execution in step 44, obtain the second weighting coordinate P2 (x, y).
10. the localization method based on the WIFI network as claimed in claim 9, it is characterized in that, the method that this step 46 obtains tag location information also comprises: reduce limits of error value D in certain proportion, repeated execution of steps 44 and step 45, up to weighting coordinate P (x, y) can't refilter till.
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Cited By (13)
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| CN103596264A (en) * | 2013-11-13 | 2014-02-19 | 百度在线网络技术（北京）有限公司 | Positioning method and device based on WIFI fingerprint technology |
| CN103874191A (en) * | 2012-12-11 | 2014-06-18 | 华东师范大学 | Positioning method based on WiFi wireless network |
| CN104376698A (en) * | 2013-08-13 | 2015-02-25 | 徐峥 | Outdoor nursing reminding device based on WIFI |
| CN104503286A (en) * | 2014-12-26 | 2015-04-08 | 上海斐讯数据通信技术有限公司 | Intelligent control system and intelligent control method |
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| WO2015172312A1 (en) * | 2014-05-13 | 2015-11-19 | 华为技术有限公司 | Positioning method and communication device |
| CN105678359A (en) * | 2016-01-20 | 2016-06-15 | 中国科学技术大学苏州研究院 | WoT based fixed asset management system and method |
| CN105916162A (en) * | 2016-04-25 | 2016-08-31 | 上海聚美物联网科技有限公司 | Dynamic scanning method |
| CN107407725A (en) * | 2015-03-16 | 2017-11-28 | 赫尔环球有限公司 | Guiding geometry extraction for device positioning |
| CN107529137A (en) * | 2017-07-19 | 2017-12-29 | 深圳市盛路物联通讯技术有限公司 | A kind of localization method and Internet of Things server based on Internet of Things |
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| CN109447218A (en) * | 2018-10-18 | 2019-03-08 | 成都芯创智联科技有限公司 | Wifi label timing reporting system and WIFI label launching technique |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682257A (en) * | 2012-05-14 | 2012-09-19 | 北京联合大学 | Object location system based on RFID (Radio Frequency Identification Device) and WIFI (Wireless Fidelity) technologies |
| CN103874191A (en) * | 2012-12-11 | 2014-06-18 | 华东师范大学 | Positioning method based on WiFi wireless network |
| CN103874191B (en) * | 2012-12-11 | 2017-11-24 | 华东师范大学 | A kind of localization method based on WiFi wireless networks |
| CN104376698A (en) * | 2013-08-13 | 2015-02-25 | 徐峥 | Outdoor nursing reminding device based on WIFI |
| CN103596264A (en) * | 2013-11-13 | 2014-02-19 | 百度在线网络技术（北京）有限公司 | Positioning method and device based on WIFI fingerprint technology |
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| CN104680733A (en) * | 2013-11-30 | 2015-06-03 | 徐峥 | Simple household indoor object finding device based on WIFI (wireless fidelity) |
| WO2015172312A1 (en) * | 2014-05-13 | 2015-11-19 | 华为技术有限公司 | Positioning method and communication device |
| CN104503286A (en) * | 2014-12-26 | 2015-04-08 | 上海斐讯数据通信技术有限公司 | Intelligent control system and intelligent control method |
| CN104503286B (en) * | 2014-12-26 | 2017-07-14 | 上海斐讯数据通信技术有限公司 | Intelligence control system and its control method |
| CN107407725A (en) * | 2015-03-16 | 2017-11-28 | 赫尔环球有限公司 | Guiding geometry extraction for device positioning |
| CN107407725B (en) * | 2015-03-16 | 2020-11-27 | 赫尔环球有限公司 | Guide geometry extraction for device positioning |
| CN105678359A (en) * | 2016-01-20 | 2016-06-15 | 中国科学技术大学苏州研究院 | WoT based fixed asset management system and method |
| CN105916162A (en) * | 2016-04-25 | 2016-08-31 | 上海聚美物联网科技有限公司 | Dynamic scanning method |
| CN107529137A (en) * | 2017-07-19 | 2017-12-29 | 深圳市盛路物联通讯技术有限公司 | A kind of localization method and Internet of Things server based on Internet of Things |
| CN107797092A (en) * | 2017-10-20 | 2018-03-13 | 浙江大学 | A kind of indoor locating system and method |
| CN107797092B (en) * | 2017-10-20 | 2021-03-30 | 浙江大学 | Indoor positioning system and method |
| CN109447218A (en) * | 2018-10-18 | 2019-03-08 | 成都芯创智联科技有限公司 | Wifi label timing reporting system and WIFI label launching technique |
| CN109447218B (en) * | 2018-10-18 | 2021-12-07 | 成都芯创智联科技股份有限公司 | Wifi tag timing reporting system and WIFI tag transmitting method |
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